function identify(context) {
    return this.name.toUpperCase()
}


function speak(context) {
    var greeting = "Hello,I'm" + identify.call(this)
    console.log(greeting);
}

var me = {
    name:'wn'
}
var you = {
 
    name:'zj'
}

// let result = identify.call(me)
// console.log(result);


// speak.call(me)
// speak()





